CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionBoston Private Wealth Llc
Latest Disclosed Ownership96,060 shares
Latest Disclosed Value $ 3,875,070
Boston Private Wealth Llc reports 44.65% increase in ownership of CSGP / CoStar Group, Inc.

On April 17, 2026 - Boston Private Wealth Llc filed a 13F-HR form disclosing ownership of 96,060 shares of CoStar Group, Inc. (MX:CSGP) valued at $3,875,070 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 66,410 shares of CoStar Group, Inc.. This represents a change in shares of 44.65% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-17 2026-03-31 13F COSTAR GROUP COM 22160N109 96,060 29,650 44.65 3,875 -13.21 0.2553
2026-02-04 2025-12-31 13F COSTAR GROUP COM 22160N109 66,410 32,923 98.32 4,465 58.05 0.2633
2025-11-06 2025-09-30 13F COSTAR GROUP COM 22160N109 33,487 -1,982 -5.59 2,825 -0.91 0.1520
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 35,469 -2,129 -5.66 2,852 -4.26 0.1528
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 37,598 -24,566 -39.52 2,979 -33.08 0.1224
2025-02-05 2024-12-31 13F COSTAR GROUP COM 22160N109 62,164 62,164 4,450 0.0831
2024-10-18 2024-09-30 13F COSTAR GROUP COM 22160N109 0 -68,614 -100.00 0 -100.00
2024-08-06 2024-06-30 13F COSTAR GROUP COM 22160N109 68,614 -3,604 -4.99 5,087 -27.08 0.1259
2024-05-15 2024-03-31 13F COSTAR GROUP COM 22160N109 72,218 -10,230 -12.41 6,976 -3.18 0.1555
2024-01-30 2023-12-31 13F COSTAR GROUP COM 22160N109 82,448 -31,586 -27.70 7,205 -17.83 0.1753
2023-10-23 2023-09-30 13F COSTAR GROUP COM 22160N109 114,034 -9,510 -7.70 8,768 -20.26 0.1926
2023-07-24 2023-06-30 13F COSTAR GROUP COM 22160N109 123,544 -35,692 -22.41 10,997 0.30 0.1987
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 159,236 -19,253 -10.79 10,963 -20.52 0.1532
2023-02-10 2022-12-31 13F CoStar Group COM 22160N109 178,489 -2,967 -1.64 13,794 9.14 0.1862
2022-11-09 2022-09-30 13F CoStar Group COM 22160N109 181,456 -5,724 -3.06 12,638 11.76 0.1846
2022-08-16 2022-06-30 13F CoStar Group COM 22160N109 187,180 -3,582 -1.88 11,308 -11.00 0.1739
2022-05-13 2022-03-31 13F CoStar Group COM 22160N109 190,762 -29,238 -13.29 12,706 -26.92 0.1702
2022-02-15 2021-12-31 13F CoStar Group COM 22160N109 220,000 1,306 0.60 17,386 -7.62 0.2851
2021-11-09 2021-09-30 13F CoStar Group COM 22160N109 218,694 -226 -0.10 18,821 3.81 0.2418
2021-08-13 2021-06-30 13F CoStar Group COM 22160N109 218,920 197,861 939.56 18,131 4.76 0.2299
2021-05-11 2021-03-31 13F CoStar Group COM 22160N109 21,059 -1,402 -6.24 17,308 -16.63 0.2411
2021-02-10 2020-12-31 13F Costar Group COM 22160N109 22,461 425 1.93 20,760 11.03 0.3047
2020-11-10 2020-09-30 13F Costar Group COM 22160N109 22,036 324 1.49 18,698 21.18 0.3084
2020-08-05 2020-06-30 13F Costar Group COM 22160N109 21,712 3,402 18.58 15,430 43.51 0.2868
2020-05-11 2020-03-31 13F Costar Group COM 22160N109 18,310 -750 -3.93 10,752 -5.72 0.2610
2020-02-13 2019-12-31 13F Costar Group COM 22160N109 19,060 -866 -4.35 11,404 -3.52 0.2076
2019-11-01 2019-09-30 13F Costar Group COM 22160N109 19,926 -1,563 -7.27 11,820 -0.72 0.2353
2019-07-10 2019-06-30 13F Costar Group COM 22160N109 21,489 -4,672 -17.86 11,906 -2.43 0.3999
2019-05-14 2019-03-31 13F Costar Group COM 22160N109 26,161 -1,132 -4.15 12,202 32.53 0.4820
2019-02-14 2018-12-31 13F Costar Group COM 22160N109 27,293 27,293 9,207 0.3928
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.